///*
// * Licensed to the Apache Software Foundation (ASF) under one or more
// * contributor license agreements.  See the NOTICE file distributed with
// * this work for additional information regarding copyright ownership.
// * The ASF licenses this file to You under the Apache License, Version 2.0
// * (the "License"); you may not use this file except in compliance with
// * the License.  You may obtain a copy of the License at
// *
// *     http://www.apache.org/licenses/LICENSE-2.0
// *
// * Unless required by applicable law or agreed to in writing, software
// * distributed under the License is distributed on an "AS IS" BASIS,
// * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// * See the License for the specific language governing permissions and
// * limitations under the License.
// */
//package org.apache.lucene.demo.xmlparser;
//
//import java.io.BufferedReader;
//import java.io.IOException;
//import java.io.InputStream;
//import java.io.InputStreamReader;
//import java.nio.charset.StandardCharsets;
//import java.util.Enumeration;
//import java.util.Properties;
//import java.util.StringTokenizer;
//
//import javax.servlet.RequestDispatcher;
//import javax.servlet.ServletConfig;
//import javax.servlet.ServletException;
//import javax.servlet.http.HttpServlet;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
//
//import org.apache.lucene.analysis.Analyzer;
//import org.apache.lucene.analysis.standard.StandardAnalyzer;
//import org.apache.lucene.document.Document;
//import org.apache.lucene.document.Field;
//import org.apache.lucene.document.FieldType;
//import org.apache.lucene.document.TextField;
//import org.apache.lucene.index.DirectoryReader;
//import org.apache.lucene.index.IndexReader;
//import org.apache.lucene.index.IndexWriter;
//import org.apache.lucene.index.IndexWriterConfig;
//import org.apache.lucene.queryparser.xml.CorePlusExtensionsParser;
//import org.apache.lucene.queryparser.xml.QueryTemplateManager;
//import org.apache.lucene.search.IndexSearcher;
//import org.apache.lucene.search.Query;
//import org.apache.lucene.search.ScoreDoc;
//import org.apache.lucene.search.TopDocs;
//import org.apache.lucene.store.RAMDirectory;
//
///**
// * Example servlet that uses the XML queryparser.
// * <p>
// * NOTE: you must provide CSV data in <code>/WEB-INF/data.tsv</code>
// * for the demo to work!
// */
//public class FormBasedXmlQueryDemo extends HttpServlet {
//
//  private QueryTemplateManager queryTemplateManager;
//  private CorePlusExtensionsParser xmlParser;
//  private IndexSearcher searcher;
//  private Analyzer analyzer = new StandardAnalyzer();
//
//  /** for instantiation by the servlet container */
//  public FormBasedXmlQueryDemo() {}
//
//  @Override
//  public void init(ServletConfig config) throws ServletException {
//    super.init(config);
//    try {
//      openExampleIndex();
//
//      //load servlet configuration settings
//      String xslFile = config.getInitParameter("xslFile");
//      String defaultStandardQueryParserField = config.getInitParameter("defaultStandardQueryParserField");
//
//
//      //Load and cache choice of XSL query template using QueryTemplateManager
//      queryTemplateManager = new QueryTemplateManager(
//          getServletContext().getResourceAsStream("/WEB-INF/" + xslFile));
//
//      //initialize an XML Query Parser for use by all threads
//      xmlParser = new CorePlusExtensionsParser(defaultStandardQueryParserField, analyzer);
//    } catch (Exception e) {
//      throw new ServletException("Error loading query template", e);
//    }
//  }
//
//  @Override
//  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//    //Take all completed form fields and add to a Properties object
//    Properties completedFormFields = new Properties();
//    Enumeration<?> pNames = request.getParameterNames();
//    while (pNames.hasMoreElements()) {
//      String propName = (String) pNames.nextElement();
//      String value = request.getParameter(propName);
//      if ((value != null) && (value.trim().length() > 0)) {
//        completedFormFields.setProperty(propName, value);
//      }
//    }
//
//    try {
//      //Create an XML query by populating template with given user criteria
//      org.w3c.dom.Document xmlQuery = queryTemplateManager.getQueryAsDOM(completedFormFields);
//
//      //Parse the XML to produce a Lucene query
//      Query query = xmlParser.getQuery(xmlQuery.getDocumentElement());
//
//      //Run the query
//      TopDocs topDocs = searcher.search(query, 10);
//
//      //and package the results and forward to JSP
//      if (topDocs != null) {
//        ScoreDoc[] sd = topDocs.scoreDocs;
//        Document[] results = new Document[sd.length];
//        for (int i = 0; i < results.length; i++) {
//          results[i] = searcher.doc(sd[i].doc);
//          request.setAttribute("results", results);
//        }
//      }
//      RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/index.jsp");
//      dispatcher.forward(request, response);
//    }
//    catch (Exception e) {
//      throw new ServletException("Error processing query", e);
//    }
//  }
//
//  private void openExampleIndex() throws IOException {
//    //Create a RAM-based index from our test data file
//    RAMDirectory rd = new RAMDirectory();
//    IndexWriterConfig iwConfig = new IndexWriterConfig(analyzer);
//    IndexWriter writer = new IndexWriter(rd, iwConfig);
//    InputStream dataIn = getServletContext().getResourceAsStream("/WEB-INF/data.tsv");
//    BufferedReader br = new BufferedReader(ne  InputStreamReader(dataIn, StandardCharsets.UTF_8));
//    String line = br.readLine();
//    final FieldType textNoNorms = new FieldType(TextField.TYPE_STORED);
//    textNoNorms.setOmitNorms(true);
//    while (line != null) {
//      line = line.trim();
//      if (line.length() > 0) {
//        //parse row and create a document
//        StringTokenizer st = new StringTokenizer(line, "\t");
//        Document doc = new Document();
//        doc.add(new Field("location", st.nextToken(), textNoNorms));
//        doc.add(new Field("salary", st.nextToken(), textNoNorms));
//        doc.add(new Field("type", st.nextToken(), textNoNorms));
//        doc.add(new Field("description", st.nextToken(), textNoNorms));
//        writer.addDocument(doc);
//      }
//      line = br.readLine();
//    }
//    writer.close();
//
//    //open searcher
//    // this example never closes it reader!
//    IndexReader reader = DirectoryReader.open(rd);
//    searcher = new IndexSearcher(reader);
//  }
//}
